Presser-foot mechanism.



M. ZAWISTOWSKI M. KOMOW.

PRESSER FOOT MECHANISM.

APPLICATION ,FILED FEB. I4. 1918.

2 SHEETS-SHEET I- 2-: INVENTOR A TTOHNEYS ms mums Flu/u co. Pnmuyna. msmnanm, n. c

M. ZAWISTOWSKI &'N. KOMOW.

PRESSER F.00T'MECHANISM.

APPLlCATlON FILED FEB. 14. 1918.

Patented Dec. 10, 1918.

2 SHEETS-SHEET 2.

m w i v 22 UNITED STATES PATENT OFFICE.

MARTIN ZAWISTOWSKI AND NICOLAS KOMOW, OF BROOKLYN, NEW YORK, ASSIGNORS TO UNITED STATES CLOTH CUTTING MACHINE COMPANY, OF NEW YORK, N. Y., A V

CORPORATION OF NEW YORK.

PRESSER-FOOT MECHANISM.

Specification of Letters Patent.

Patented Dec. 10, 1918.

Application filed February 14, 1918. Serial No. 217,212.

tive and convenient and well adapted for the type of machine in question. A member is mounted upon the front of the machine turning about a fore and aft axis, and provided with teeth embracing the'bar and adapted to hold the same against upward and downward movement, respectively, and th s member is turned in one direction by a spring to cause the teeth to engage the opposite sides of the bar, which are grooved for the pur pose, and may be turned in the opposite direction to release the bar by a vertically tilting lever fulcrumed upon the side of the machine and connected, as by a forward link, with the double toothed member.

In the drawings:

Figure 1 is a side elevation of a machine embodying the invention;

Fig. 2 is a partial front elevation;

Fig. 3 is a rear perspective view of the holding and releasing wheel;

Fig. 1 is a vertical section through the holding and releasing means; and

Fig. 5 is a perspective view of the bearing.

Machines of the character indicated are well known and a brief description of their general features will, therefore, be sufficient. The machine has a movable base 1, from which rises a standard support 2 bearing a driving motor 3. This motor drives a straight vertical reciprocatory knife 4, suitably mounted upon the front of the machine.

A handle 5 projecting rearward from the standard enables the machine to be advanced in the direction of the out. In the partlcular machine selected for illustration the front of the motor and the crank and crosshead mechanism (not shown) for driving the knife are inclosed by a front cover 6. 'The presser-foot 7 is fixed upon the lower end of a vertical adjustable bar 8, which extends below the front cover 6 in guarding relation to the knife.

Upon the front of the cover 6 is an oblong vertically disposed guide block 9, the body 10 of which may be integral with the said cover. The front of the said body is circularly chambered, the chamber 11 being cut away or open at the sides, owing to the oblong form of the block. It is further provided at top and bottom with slotted openings 12, constituting portions of a vertical passageway, which intersects the chamber 11' and in which the bar 8 is guided. In this preferred construction the four postlike wall portions 13 are tapped for the reception of screws 14:, which secure a cover plate 15 to the body 10. A wheel 16 occupies the chamber 11 and is provided with teeth 17 for engaging the grooves 18, which areformed in both sides of the bar 8. The

said teeth are preferably constituted by blades 19, which are inserted in inward projecting oblique relation in slots cut in a rim flange 20 of the wheel. I This rim flange projects at opposite sides of the lock and is knurled, as indicated, to enable it to be conveniently grasped and turned by hand. Openings 21 cut in the top and bottom of the said rim flange accommodate the guard and presser-foot bar 8. In addition to the journal support which the wheel may receive at its periphery in the arcuate inner.

surfaces 22 of the posts 13, it is provided with a forwardly projecting shaft portion 23, which finds a bearing in a journal boss 24 on the cover plate 15 in rear of the bear ing opening 25. The interior of this boss is enlarged, in order to form a spring barrel which accommodates a spiral spring 26, one I end of which is engaged in a hole in the wheel 16 while the opposite end enters a hole in the front of the boss. The blades 19, it will be observed, are located at different heights, the upper one extending obliquely downward toward its side of the bar 8,

while the lower blade extends obliquely upward toward the opposite side. The spring 26 is so tensioned as to urge the wheel in the direction which will carry the upper blade upward and inward and the lower blade downward and inward, thereby I causing the edges of both blades to enter the grooves in the opposite sides of the .bar. Under these circumstances the upper downwardly inclined blade holds the bar and resser-foot against upward movement, while the lower upwardly inclined blade holds against downward movement.

slight turning movement of the wheel in the opposite direction withdraws the teeth from the bar, which is accordingly free to move in either direction.

The release of the holding wheel is effected by means of a lever 27, the forward portion of which is fulcrumed at 28 upon a transverse pivot pin on the side of the front cover 6. A link 29 is pivoted at 30 upon a stub shaft extension of the front end of the lever 27 and at 81 to the rim 20 of the wl1ee116, From the fulcrum pivot 28 the lever extends rearward into convenient relation to the handle 5, where it can be operated by downward pressure to turn the wheel member 16 in the releasing direction.

hat we claim as new is:

1. In a clotlrcutting machine of the kind described, Presser-foot mechanism comprising the combination with a vertical slidable guard andpresser-foot bar having 'ooved sides, of'a spring-pressed wheel having teeth embracing the bar and cooperative with said grooved sides to hold against upward and downward movement respectively, and a mounting whereon said wheel may turn.

2. In a cloth-cutting machine of the kind described, the combination with a vertical guard and presser-foot bar mounted slidably in front of the knife, of a holding and re leasing member havingteeth embracing the bar, a mounting whereon said member is journaled to turn about a fore and aft axis, and a spring urging said member in one direction to cause its teeth to grip the opposite sides of the bar, turning of the member in th opposite direction releasing the bar.

3. In a cloth-cutting machine of the kind described, the combination with a vertical guard and presser-foot bar mounted slidably in front of the knife, of a holding and releasing member having teeth embracing the bar, a mounting whereon said member is journaled to turn about a fore and aft axis, a spring urging said member in one direction to cause its teeth to grip the opposite sides of the bar, turning of the member in the opposite direction releasing the bar, and a releasing lever fulcrumed at one sideof the machine standard upon a transverse axis and having its forward end connected with said member.

releasing lever fulcrunied on a transverse axis.

5. In a cloth-cutting machine of the kind described, the combination with a vertical guard and presser-foot bar mounted slidably in front of the knife, of a suitable mounting and a spring-urged wheel journaled thereon to turn about a fore and aft axis and having a rim flange cut away at top and bottom to accommodate said bar, and internal teeth located at different heights on opposite sides of the bar to grip the same.

6. In a cloth-cutting machine of the kind described, the combination with a vertical guard and Presser-foot bar mounted slidably in front of the knife, of a suitable mounting and a spring-urged wheel journaled thereon to turn about a fore and aft axis and having a rim flange cut away at top and bottom to accommodate said bar, and oblique inwardly projecting blades inserted in said flange at different heights at opposit sides of the bar.

I. In a cloth-cutting machine of the kind described, the combination of a bearing block upon the front of the machine having a chamber to receive a wheel and a vertical passageway intersecting said chamber, a guard and presser-foot bar in said passageway, and a springrged holding and releasing wheel in said chamber with its periphery projecting at opposite sides of the block.

8. In a cloth-cutting machine of the kind described, the combination of a bearing block upon the front of the machine having a chamber to receive a wheel and a vertical passageway intersecting said chamber, a guard and presser-foot bar in saidpassageway, and a spring-urged holding and releasing wheel in said chamber having a forward projecting shaft portion journaled in the front wall of said block.

9. In a cloth-cutting machine of the kind described, the combination of a bearing block upon the front of the machine having a chamber to receive a wheel and a vertical passageway intersecting said chamber, a guard and presser-foot bar in said passageway, and a holding and releasing wheel in said chamber said block having a front cover plate provided with a journal boss, a forward projecting shaft portion on the wheel journaled in said boss, and a coil spring housed in said boss and acting upon the wheel in the direction to cause it to grip the bar.

10. In a cloth-cutting machine of the kind described, the combination with a vertical slidable guard and presser-foot bar, of a suitable mounting and a spring-urged wheel journaled thereon in front of said bar having holding teeth at opposite sides and at different elevations to grip and release the bar.

11. In a cloth-cutting machine of the kind tion, a releasing lever fulorumed upon one described, the combination With a vertical side of the machine on a transverse axis, and slidable guard and resser-foot bar, of a a link connecting the forward end of said 10 holding and releasing member for said bar, lever with said member.

5 a bearing block whereon said member is mounted to turn about a fore and aft axis, MARTIN ZAWISTOWSKI.

a spring urging the member in one direc- NICOLAS KOMOW.

Copies of this patent may be obtained for five cents each, by addressing the commissioner o! Iatents, Washington, D. G." 

